1. The Universe (2)2. Nuclear Fission and Fusion (3)3. Electricity, its Heating and Chemical Effects (3)4. Source of Energy (3)5. Refraction of Light (3)6. Reflection of Light (3)7. Optical Instruments (3)8. Magnetic Effects of Electric Current (3)9. Motion (2)10. Force (3)11. Gravitation (3)12. Work, Power and energy (3)13. Heat (3)14. Wave Motion and Sound (3)
Questions: 40 Marks: 160
PHYSICS
2 Physics
Multiple Choice Questions
1. Name the star closest to us :a) Pole star b) Alpha centuaric) Uranus d) None of these
2. Big Bang theory was proposed by :a) Newton b) Hubblec) Kepler d) All of these
3. Which planet is called the morning star aswell as the evening star ?a) Venus b) Mercuryc) Mars d) Jupiter
4. Great Bear is commonly known asa) Saptrishi b) Dhruv tarac) Pole star d) Orion
5. Planets which do not have satellites area) Marsb) Venus & Mercuryc) Jupiter d) Saturn
6. The planet having the largest number ofsatellites amongst the following isa) Saturn b) Jupiterc) Mars d) Uranus
7. Natural satellite of earth isa) Sun b) Moonc) Saturn d) Uranus
8. The smallest planet amongst the followingisa) Mercury b) Venusc) Jupiter d) Saturn
9. The biggest planet amongst the following isa) Mercury b) Venusc) Jupiter d) Saturn
10. Any heavenly body that revolves around aplanet is called
CHAPTER - 1THE UNIVERSE
a) comet b) nebulaec) star d) Satellite
11. Light takes ————— seconds to reachearth from the suna) 400 b) 450c) 500 d) 550
12. The planet nearest to the sun isa) Mercury b) Venusc) Jupiter d) Saturn
13. Pulsar is another name ofa) White dwarf b) Neutron starc) Nabula d) Black hole
14. SHOOTING STAR is another name fora) comet b) nebulaec) meteor d) Solar flare
15. Distance between Sun and Earth is about______ million Kma) 159.6 b) 150.6c) 140.6 d) 149.6
16. Tail of a comet always pointsa) towards the sunb) away from the sunc) towards moond) towards center of earth and sun
17. Sun is also known asa) Star b) Polec) Setellite d) Planet
18. Which if the following planets have ringsaround it?a) Uranus b) Marsc) Jupiter d) Saturn
19. Planet Venus spins about its axis froma) west to east b) east to westc) north to southd) south to north
Physics 3
20. A family of stars is called aa) solar system b) galaxyc) universe d) none of these
21. Moon is setellite ofa) Mars b) Earthc) Jupitar d) Saturn
22. Inferior planet amongst the following isa) Mercury b) Jupiterc) Neptune d) none of these
23. Titan is a satellite ofa) Mercury b) Venusc) Neptune d) Saturn
24. Triton is a satellite ofa) Mercury b) Venusc) Neptune d) Saturn
25. Oberon is a satellite ofa) Mercury b) Venusc) Neptune d) saturn
26. All stars appear to move froma) east to west b) west to eastc) north to south d) south to north
27. Which of the following does not emit anylighta) sun b) white dwarf starc) proto star d) alpha centauri
28. Exploding star is calleda) nova b) supernovac) pulsar d) black hole
29. Number of supernovas that have beenrecorded till date area) 2 b) 3c) 4 d) 5
30. Indian name mangal is for the planeta) Mars b) Uranusc) Neptune d) Saturn
31. Meteor is also known asa) Comet b) Shooting Starc) Nabula d) Pole star
32. Temperature of the surface of the Sun isa) 5550°C b) 5005°Cc) 5050°C d) 5500°C
33. Shani graha is the name fora) Mars b) Uranusc) Neptune d) Saturn
34. Indra is the name fora) Mars b) Uranusc) Neptune d) Saturn
35. Which of the following takes minimum timeto revolve around the suna) Mercury b) Uranusc) Neptune d) Saturn
36. Hottest planet of the solar system isa) Mercury b) Uranusc) Neptune d) Saturn
37. Asteroids area) Small Planetb) Shooting Starsc) Found in a belt between earth and venusd) none of these
38. SROSS stands fora) Stretched Rohini Satellite Seriesb) Stretching of shooting starc) search of satellite stationd) none of these
Answers1 a 2 b 3 a 4 a 5 b6 a 7 b 8 a 9 c 10 d11 c 12 a 13 b 14 c 15 d16 b 17 a 18 d 19 b 20 b21 b 22 a 23 d 24 c 25 b26 a 27 c 28 b 29 d 30 a31 b 32 d 33 d 34 b 35 a36 a 37 a 38 a 39 d 40 b41 c 42 a
4 Physics
Multiple Choice Questions1. Which of the following nuclei will be more
stable :a) 32
16Sb) 27
13Alc) 235
92 U d) 147 N
2. Name the city where enrichment of uraniumis done :a) Muradabad b) Sikandrabadc) Hyderabad d) Illahabad
3. The nuclear fuel in the sun is :a) Helium b) Nitrogenc) Hydrogen d) Pu-239
4. Which of the following is used as a coolant :a) Graphite b) Waterc) Heavy water d) None of these
5. The number of neutrons in 92U238 isa) 330 b) 238c) 146 d) 92
6. The number of protons in 92U238 isa) 330 b) 238c) 146 d) 92
7. Atom bomb is based on the principle of:a) Nuclear fusionb) Nuclear fissionc) Radio activityd) Nuclear fission and fusion both
8. 611c on decay produces:-
a) Positron b) ß Particlec) a Particle d) None
9. A Cyclotron of an electric field cannot ac-celerate:-a) Proton b) Deuteronsc) Neutrons d) None
10. Specific charge is given bya) e/m b) m/ec) e x m d) em
11. The specific charge of an electron isa) 1.602 x 1019 Cb) – 1.602 x 1019 Cc) – 1.76 x 1011 C/kgd) 1.76 x 1011 C/kg
12. An atom bomb is based ona) nuclear fissionb) nuclear fusionc) both fission and fusiond) none of these
13. The average energy released during fissionof a uranium atom is abouta) 50 MeV b) 100 MeVc) 200 MeV d) 400 MeV
14. The atomic number of the parent atom,when a beta particle is given outa) increases by unityb) decreases by unityc) gets halvedd) remains same
15. Radioactivity was discovered bya) Bohr b) Becquerelc) Curie d) Rutherford
16. Sun energy results because ofa) nuclear blastsb) nuclear fissionc) nuclear fusiond) none of these
17. Neutron was discovered bya) Curie b) Becquerelc) Chadwick d) Rutherford
CHAPTER - 2NUCLEAR FISSION AND FUSION
Physics 5
18. The temperature of sun’s core isa) 106 °C b) 105 °Cc) 104 °C d) 103 °C
19. Out of the following, the fuel used in nuclearreactors isa) U-235 b) U-236c) U-237 d) U-239
20. The massless, neutral subatomic particle inan atom isa) neutron b) Protonc) neutrino d) Positron
21. Which is not fissionable material:-a) U-238 b) U-235c) U-233 d) U-239
22. The process of increasing U-235 percantagein U-238 is calleda) fusionb) fissionc) chain reactiond) enrichment
23. Amongst the following , the most importantpropellent used in rockets isa) liquid petrolb) liquid hydrogenc) liquid oxygend) none of these
24. The first controlled chain reaction wascarried out bya) Otto Hahnb) Newtonc) Fermid) Bethe and Blotch
25. The first atomic power station in India isa) Bhabha atomic Research Centreb) Narora power stationc) Tarapur Atomic Power stationd) Hyderabad atomic power station
26. Hydrogen bomb once exploded is a/ana) controlled nuclear fusion reactionb) Uncontrolled nuclear fusion reaction
c) controlled nuclear fission reactiond) Uncontrolled nuclear fission reaction
27. Nuclear fusion takes place ata) low temperatureb) low pressure c) high temperatured) high pressure
28. A positron has the same mass asa) electron b) protonc) positron d) deuteron
29. 614c in upper atmosphere is formed by the
action of Neutrons on:-
a) 714 N b) 8
17 O
c) 612 C d) 8
18 O
30. Control rods used in nuclear reactors aremade ofa) Steel b) Cadmiumc) boron d) Plutonium
31. Heavy water is:-a) H2O18 b) H2O16
c) D2O d) None
32. Which nuclide is radioactive:-a) C12 b) H2
d) O16 d) Both C14 and H3
33. The percentage of mass that is convertedinto energy during nuclear fusion isa) 40% b) 20%c) 10% d) 1%
34. Nuclear fission reactions are:-a) uncontrolled in atom bombb) Controlled in Nuclear reactorsc) Auto catalytic reactiond) All of these
35. Which of the following can pass through 20cm thick steel?a) particles b) particlesc) rays d) none of these
6 Physics
36. Half life of radium is 1600 years. Thefraction of the sample of radium thatremains after 6400 years is
a)12 b)
14
c)18 d)
116
37. In the following reaction X is24 4 1
12 2 14 0XMg He Si n
a) 27 b) 28c) 24 d) 20
38. Which pair represents isobars
a) 1940
1840K and Ar
b) 23
24He and He
c) 1224
1225Mg and Mg
d) 1940
2041K and Ca
39. 7N13 decays to 6C13 by emitting aa) protonb) electronc) neutrond) positron
40. All nuclides exhibit radio activity when theatomic number exceeds:a) 80 b) 82c) 90 d) 92
Answers1 d 2 c 3 c 4 b 5 c6 d 7 b 8 a 9 c 10 a11 c 12 a 13 c 14 a 15 b16 c 17 c 18 a 19 a 20 c21 a 22 d 23 b 24 c 25 c26 b 27 c 28 a 29 a 30 b31 c 32 d 33 d 34 d 35 c36 d 37 a 38 a 39 d 40 b
Physics 7
Multiple Choice Questions
1. Three 3 ohm resistors are connected to forma triangle. The resistance between any twocorners is :a) 6 b) 4/3c) 3/4 d) 2
2. The rate of flow of electric charge is definedas:-a) current b) Voltagec) Power d) electron density
3. Which instrument has maximum resistance:a) Ammeter b) Voltmeterc) Galvanometer d) Voltaic cell
4. When cells are connected in parallel, thena) the current decreasesb) the current increasesc) the emf increasesd) the emf decreases
5. A body has a negative charge of 1 coulomb.It means thata) it has lost one electronb) it has acquired one additional electronc) it has lost 6·25 × 1018 electrond) it has acquired 6.25 × 1018 additional
electrons
6. The ratio of electric force between twoelectrons to two protons separated by thesame distance in air isa) 100 b) 106
c) 104 d) none of the above
7. An ebonite rod acquires a negative chargeof 0.8 × 10–10 C. The number of excesselectrons it has isa) 0.5 × 109 b) 0.5 × 10–9
c) 0.5 × 10–29 d) 0.5 × 1029
8. If a charged body attracts another body, thecharge on the other body isa) negative b) positivec) may be positive or negatived) must be zero
9. Electromotive force of a cell has the unitsa) ampere b) Voltc) dyne d) joule
10. One can express electrical energy in
kilowatt-hours = 2 ......1000
voltR
a) time in hours b) time in minutesc) time in seconds d) time in days
11. Kilowatt hour is the unit ofa) force b) momentumc) impulse d) energy
12. Electron volt (eV) is the unit ofa) potential differenceb) energyc) mass d) density
13. 1 kWh is equal toa) 3.6 x 103 J b) 3.6 x 104 Jc) 3.6 x 105 J d) 3.6 x 106 J
14. 1 MeV is equal toa) 1.6 x 10-13 J b) 1.6 x 10-14 Jc) 1.6 x 10-15 J d) 1.6 x 10-16 J
15. The substances that allow large currents toflow through them are calleda) semiconductors b) insulatorsc) conductors d) none of these
CHAPTER - 3ELECTRICITY, ITS HEATING AND CHEMICAL EFFECTS
8 Physics
16. The direction of conventional current isa) the direction in which electrons flowb) the direction of flow of positive chargec) the direction of motion of atomsd) the direction of motion of molecules
17. The unit of resistance isa) Ohm b) mhoc) Ohm – meter d) Ohm/meter
18. The unit of specific resistancea) Ohm b) mhoc) Ohm – meter d) Ohm/ meter
19. One Ampere is equal toa) 106 µA b) 10–6 µAc) 106 mA d) 10–4 µA
20. The reciprocal of resistivity of a conductorisa) conductance b) conductivityc) resistance d) none of these
21. Repulsive force between two particlesseparated by a distance of 3.2 × 10–15m inair isa) 90 N b) 900 Nc) 9000 N d) None of these
22. Two point charges +6 C and -2 C attracteach other with a force of 12 N. If a chargeof – 4 C is added to each of these charges,the force would bea) zero b) 8 Nc) 4 N d) 12 N
23. Force between two charges separated by acertain distance in air is F. If each chargewere doubled and distance between themalso doubled, force. would be,a) F b) 2 Fc) 4 F d) F/4
24. The best instrument far measurement ofe.m.f of a cell isa) Voltmeter b) Meter bridgec) Potentiometer d) ammeter
25. Number of electrons in one coulomb ofcharge will bea) 5·46 × 1029 b) 6·25 × 1018
c) 7·6 × 1019 d) 9 × 1011
26. 1 volt is numerically equal to
a)1NC b)
1JC
c)1NSec
d)1J
Sec
27. Electric potential of earth is taken to be zero,because earth is a gooda) insulator b) conductorc) semi-conductor d) dielectric
28. Laws of electrolysis were given bya) Oersted b) Faradayc) Newton d) Lenz
29. Charge on 2 electron isa) 3.2 × 10-18C b) 3.2 × 1018Cc) 3.2 × 10-19C d) 3.2 × 10-19C
30. The length of a conductor is halved, itsconductivity will bea) doubled b) halvedc) quadrupled d) unchanged
31. The length of a conductor is doubled. Itsconductance will bea) unchanged b) halvedc) doubled d) quadrupled
32. Value of absolute electrical permittiability offree space isa) 8.854×10-10 b) 8.854×10-22
c) 8.854×10-12 d) 8.854×10-8
33. The internal resistance of a cell depends ona) the distance between the platesb) the area of the plates immersedc) the concentration of the electrolyted) all the above
Physics 9
34. By increasing the temperature, the specificresistance of a conductor and semiconduc-tora) increases for bothb) decreases for bothc) increases, decreasesd) decreases, increases
35. A resistor of 20 cm length and resistance 5ohm is stretched to a uniform wire of 40 cmlength. The resistance now isa) 5 ohm b) 10 ohmc) 20 ohm d) 200 ohm
36. There are two charge +3c and +4c. Theratio of forces acting on them will bea) 2:6 b) 1:1c) 1:3 d) 3:1
37. Specific resistance of a wire depends upona) length b) cross-sectional areac) mass d) none of these
38. S.I. unit of potential differencea) Volt b) Amperec) Joule d) Newton
39. The equivalent resistance of network ofthree 2resistors can not bea) 0.67 b) 2 c) 3 d) 6
40. I kwh is equal toa) 3.6×103J b) 36×100Jc) 3.6×10-3J d) 3.6×106J
41. A current of 0.5A is drawn by a filament ofan electric bulb for 10 minutes. The amountof electric charge that flow through thecircuit isa) 100C b) 200Cc) 110C d) 300C
The work done to move a charge 2C acrosstwo point having pottential difference 2V isa) 1J b) 2J
c) 4J d) 3J
1 B.O.T. is equal toa) 1wh b) 1KWhc) 1mWh d) 1MWh¶
44. The commonly used fuse wire is made ofa) copper b) leadc) an alloy of copper and leadd) an alloy of lead and tin
45. The domestic consumption of electricity iscalculated ina) joules b) wattsc) kilowatt/hour d) kilowatt-hour
46. The filament of an electric bulb is generallymade ofa) copper b) nichromec) constantan d) tungsten
47. How much electrical energy in kW hr isconsumed in operating 10, 100w bulbs for10 hours per day in a month (30 days),a) 500 b) 400c) 300 d) 200
48. A 25 W and 100 W bulbs are joined in seriesand connected to the mains. Which bulb willglow brighter ?a) 25 W b) 100 Wc) both will glow with same brightnessd) none of these
49. 100J of heat are produced in each secondin a 4 resistance. the potential differenceacross the resister isa) 20V b) 21Vc) 40V d) 22V
50. The power dissipated by light bulb with 4ohmresistance when connected in parallel to 12v battery is:-a) 036 W b) 0.036 Wc) 3.6 W d) 36 W
10 Physics
51. An electric bulb is connected to a 220Vgenerator. The current is 0.5A. The powerof bulb isa) 120W b) 110Wc) 130W d) 140W
52. SI unit of electro power isa) J b) Nc) dyne d) Watt
53. A heater is marked 1000 W. The energyconsumed by it in ten hours is:-a) 10 J b) 10 KJc) 10 kwh d) 10wj
54. Faraday’s laws are consequence ofconservation ofa) charge b) momentumc) energy d) electric current
55. For electroplating a utensil such as say spoon,it is placed in the voltameter ata) cathode b) anodec) cathode or anode d) none of these
56. Electrolysis is carried in a vessel calleda) voltmeter b) voltameterc) galvanometer d) all of these.
57. A million electrons are added to a pith ball.Its charges is
a) 1·6 × 10–19 C b) 1·6 × 10–13Cc) – 1·65 × 10–13C d) – 1·6 × 10–10C
58 An ebonite rod acquires a negative chargeof 1.6 × 10–10 C. The number of excesselectrons it has isa) 1 × 109 b) 1 × 10–9
c) 1 × 10–29 d) 1 × 1029
59. A heating element of an electric toaster hasa resistance of 22 and is connected to110V circuit. The heat generated in 1minwill bea) 9.68 × 103 cal b) 5 k calc) 7.89 k cal d) 12.61 k cal
60. An electric heater of resistance 6ohm is runfull 10 minutes on a 120volt line. The energyliberated in this period of time is:-a) 7.2x 105J b) 14.4 x 105Jc) 43.2x 105J d) 28.8 x 105J
61. The current Capacity of the storage cell is3Ah- The maximum current it can supplyfull half hour is ?a) 1.5A b) 3Ac) 4.5A d) 6A
62. A heater is marked 2000 W. The energyconsumed by it in ten hours is:-a) 20 J b) 20 KJc) 20 kwh d) 20wj
Answers1 d 2 a 3 b 4 b 5 d 6 a 7 a8 c 9 b 10 a 11 d 12 b 13 d 14 a15 c 16 b 17 a 18 b 19 a 20 b 21 a22 d 23 a 24 c 25 b 26 b 27 b 28 b29 c 30 a 31 b 32 c 33 d 34 c 35 c36 b 37 d 38 a 39 b 40 d 41 d 42 c43 c 44 d 45 d 46 b 47 c 48 a 49 a50 b 51 b 52 d 53 c 54 c 55 b 56 b57 c 58 a 59 c 60 b 61 d 62 c
Physics 11
Multiple Choice Questions
1. Very high temperature can be obtained insolar heater devices by using :a) Plane reflectorsb) Parabolic Reflectorsc) Plane absorbersd) None of these
2. The source of geothermal energy is :a) Magma b) Oceanc) Sun d) CO2
3. A single solar cell measuring about 4 cm2
provide electricity of the voltage :a) 10 V b) 0·4 to 0·5Vc) 4 to 5V d) none of these
4. The gaseous fuel produced by see weedplantation is :a) natural gas b) producer gasc) methane d) none of these
5. ........... is added to L.P.G. to detect gasleakage :a) CH4 b) CH3c) C2H5SH d) C2H5OH
6. Steam Engine converts heat energy intoa) electrical energyb) mechanical energyc) nuclear energyd) chemical energy
7. Which of the following is a non- renewablesource of energy?a) Wood b) Sunc) Fossil fuels d) Wind
8. In a battery, chemical energy is convertedintoa) electrical energyb) mechanical energy
CHAPTER - 4SOURCES OF ENERGY
c) nuclear energyd) chemical energy
9. Energy possessed by a body by virtue of itsposition and configuration is calleda) kinetic energyb) mechanical energyc) nuclear energyd) potential energy
10. Energy possessed by a body by virtue of itsmotion is calleda) kinetic energyb) mechanical energyc) nuclear energyd) potential energy
11. The ratio of CGS unit and SI unit of energya) 10-4 b) 10-5
c) 10-6 d) 10-7
12. The country ranks first in the world toproduce electricity from wind:-a) India b) USAc) Denmark d) Japan
13. Which of the following is different fromthe others?a) Watt b) ergc) Joule d) kilo watt hour
14. The biggest unit amongst the following isa) electron volt b) joulec) Kilowatt hour d) erg
15. One kilowatt hour is equal toa) 3.6 mJ b) 3.6 Kc) 3.6 MJ d) 3.6 J
16. If speed of a vehicle doubles than its kineticenergy becomesa) twice b) four foldc) six times d) none of these
12 Physics
17. One Kilowatt is equal to ——— Horsepowera) 1.34 b) 1.44c) 1.54 d) 1.64
18. The main constituent of LPGa) Methane b) butanec) Hydrogen d) none of these
19. Work done in lifting 1 kg mass to a height of9.8 m isa) 9.8 J b) (9.8)2J
c) (9.8)3 J d) 1
9 8.
20. Which of the following devices transformslight energy into chemical energy?a) motor b) dynamoc) fan d) none of these
21. Wind possessesa) potential energyb) kinetic energyc) electrical energyd) chemical energy
22. The efficiency of heat engine can never bea) 100% b) 50%c) 30% d) 10%
23. Wood is aa) secondary fuel b) primary fuelc) liquid fuel d) processed fuel
24. 1 erg isa) 107J b) 10-8 Jc) 108J d) 10-7J
25. Steam when passed over hot coke producesa) water gas b) natural gasc) producer gas d) coal gas
26. Producer gas is a mixture ofa) carbon monoxide and hydrogen gasb) carbon monoxide and oxygen gasc) carbon monoxide and nitrogen gasd) carbon monoxide and sulphur gas
27. Which of the following is not obtained byfractional distillation of petroleuma) Asphalt b) waxc) coal gas d) petrol gas
28. Least calorific value is ofa) wood b) alcoholc) biogas d) coal
29. The calorific value of gasoline isapproximatelya) 37 b) 47c) 57 d) 67
30. Kerosene burns more rapidly than cokebecause it hasa) more oxygenb) liquid hydrocarbonsc) low ignition temperatured) none of these.
31. Which of the following is a non renewablesource of energy?a) Gobar gasb) sun energyc) coald) energy of tides
32. The Source of energy of the sun isa) Nuclear fissionb) Nuclear fusionc) Chemical reactiond) None of these
33. The source of energy which is different fromothers is:a) uraniumb) natural gasc) petroleum d) wood
34. Radiation which are harmful to the livingorganisms are:a) Infra-red radiationb) Ultra- violet radiationc) visible radiationd) Micro- waves
Physics 13
35. Water energy is calleda) hydro energyb) chemical energyc) mechanical energyd) solar energy
36. Ocean energy is calleda) wave energyb) solar energyc) tidal energyd) none of these.
37. SI unit of calorific value of a fuel isa) Joule b) Kg/Jc) J/Kg d) erg/kg
Answers1 b 2 a 3 b 4 c 5 c6 b 7 c 8 a 9 d 10 a11 d 12 c 13 a 14 c 15 c16 b 17 a 18 b 19 b 20 d21 b 22 a 23 b 24 d 25 a26 c 27 c 28 a 29 b 30 c31 c 32 c 33 d 34 b 35 a36 c 37 c 38 b 39 c 40 d
38. The greatest calorific value amongst thefollowing is ofa) woodb) petrolc) biogasd) kerosene
39. A welder wears coloured glasses to protecthis eyes from:-a) red raysb) infra- red raysc) ultra- violet raysd) the becteria
40. Which of the following converts light energyinto electrical energya) motor b) dynamoc) battery d) solar cell
14 Physics
CHAPTER - 5REFRACTION OF LIGHT
Multiple Choice Questions
1. In case of spherical mirrors, the focal lengthand radius of curvature are related as :
a) R2
f b) f = 2R
c) f = R d) None of these
2. Magnification produced by a plane mirroris :a) +1 b) +2
c) +1/2 d) –1
3. When a ray of light enters a glass slab fromair :a) Its wavelength decreasesb) Its wavelength increasesc) Its frequency increasesd) Neither wavelength nor Frequency
changes
4. Which one is false:
a) 1
sin Cn b) 1P =
fc) R = 2f d) None of these
5. When light travels from glass to air, theincident angle is
1 and the refracted angle
is 2. The true relation is
a) 1 =
2b)
1 <
2c)
1 >
2d) none of these
6. When light travels from one medium intoanother, it suffers:a) reflection b) refractionc) interference d) dispersion
7. When a ray of light travels from an opticallyless denser medium to a more densermedium, ita) bends towards the normalb) bends away from the normalc) passes undeviatedd) none of these
8. A monochromatic beam of light passesfroma denser medium to a rarer medium.As a result:a) Its velocity increasesb) Its velocity decreasesc) Its frequency decreasesd) Its wavelength decreases
9. The ratio of the sine of angle of incidenceto the sine of angle of refraction is calleda) Brewster’s lawb) Snell’s lawc) Young’s lawd) Huygens’ law
10. The phenomenon due to which a pencildipped in water appears to be bent isa) reflection b) refractionc) diffraction d) interference
11. A well cut diamond appears bright because:-a) It emits lightb) It is radioactivec) of total internal reflectiond) It has high density
12. When a ray of light travels from air to aglass slab than it’sa) wavelength decreasesb) wavelength increasesc) frequency increasesd) frequency decreases
Physics 15
13. Twinkling of stars is due toa) refraction b) reflectionc) scatteringd) polarization of light
14. The phenomenon of mirage is due toa) reflection b) refractionc) total internal reflectiond) diffraction
15. The refractive index of air is 1.5. Then thespeed of light in air isa) 2 × 108 m/s b) 2.25 × 108 m/sc) 4 × 108 m/s d) 1.33 × 108 m/s
16. The basic reason for the shining of adiamond isa) reflection b) refractionc) dispersiond) total internal reflection
17. When light travel from more denser to lessdenser medium, ita) bend away from the normalb) bend toward the normalc) passes undeviatedd) None of these
18. The concave lens is also known asa) Converging lensb) Diverging lensc) Collecting lensd) None of these
19. A glass slab is placed in the path of a beamof convergent light. The point ofconvergence of light.a) Move towards the glass slabb) moves away from the glass slabc) remains at the same pointd) undergoes a lateral shift
20. Relationship between refractive index(n),velocity of light in vacuum (c) and velocityof light in medium (v) is
a) n = v/c b) n = cvc) c = v/n d) n = c/v
21. If the speed of light in vacuum is 3×108 m/sec, then its velocity in a medium ofrefractive index 1.5 isa) 2 × 108 b) 2 × 10-8
c) 2 × 103 d) 2 × 10-3
22. If the critical angle for total internalreflection from a medium to vacuum is 30º,the velocity of light in the mediuma) 3 × 108 m/s b) 1.5 × 108 m/sc) 6 × 108 m/s d) 3 × 104 m/s
23 A lens which is thicker in the middle andthinner at the edges is calleda) convex lens b) concave lensc) cylindrical lens d) spherical lens
24. A lens which is thin in the middle and thickerat the edges is calleda) convex lens b) concave lensc) cylindrical lens d) spherical lens
25. Mirages are observed in deserts due to thephenomenon ofa) Interference of lightb) total reflection of lightc) Scatteringd) double refraction of light
26. The unit of power of a lens isa) meter b) dynec) Newton d) Dioptre
27. The least distance of distinct vision for anormal person isa) 1m b) 0.5 mc) 0.25 m d) 0.125 m
28. The focal length of a lens is 100 cm. Thenits power isa) 2 D b) 1 Dc) 25 D d) 50 D
16 Physics
29. If power of a lens is - 0.1 D, its focal lengthisa) 1m b) – 1 mc) 10 m d) – 10 m
30. The refractive index of glass is 1.5, thevelocity of light in glass is:a) 3x1010 cm/sec b) 4.5 x1010 cm/secc) 2x1010 cm/sec d) 1010 cm/sec
31. The index of refraction of diamond is 3.0velocity of light in diamond in cm per secondis approximately.a) 6x1010 b) 3.0x1010
c) 2x1010 d) 1.0x1010
32. Which of the following pairs can produceerect, diminished and virtual image ?a) convex mirror and concave lensb) convex lens and convex mirrorc) convex lens and concave mirrord) concave lens and concave mirror
33. Two thin Lenses, one of focal length + 30cmand other of focal length -20cm are put incontact. The combined focal length is:a) +15cm b) -60cmc) +30cm d) -30cm
34. A concave lens always givesa) virtual image b) diminished magec) erect imaged) all of the above
35. Two thin lenses of focal length -25cm and+30cm are placed incontact with each other.The combination has focal length:-a) -10cm b) 50cmc) -150cm d) 12cm
36. Brilliance of diamond is due toa) shape b) cuttingc) reflectiond) total internal reflection
37. If critical angle for a medium is 60º, thenthe refractive index of the medium is
a)23 b) 3
2
c) 3 d) 23
38. The refractive index of glass is 1.5. Thenthe speed of light in water isa) 3 × 108 m/sec b) 2·00 × 108 m/secc) 4 × 108 m/sec d) 1·33 × 108 m/sec
39. If the critical angle for total internalreflection from a medium to vacuum is 45º,the velocity of light in the mediuma) 3 × 108 m/sec b) 2.13 × 108 m/secc) 6 × 108 m/sec d) 3 × 104 m/sec
40. A mark at the bottom of a liquid appears torise by 0.2 m. The depth of the liquid is 1m.The refractive index of the liquid isa) 1·33 b) 1/10c) 10/8 d) 1·5
Answers1 a 2 a 3 a 4 d5 b 6 b 7 a 8 a9 b 10 b 11 c 12 a13 a 14 c 15 a 16 d17 a 18 b 19 a 20 d21 a 22 b 23 a 24 b25 b 26 d 27 c 28 b29 d 30 c 31 d 32 a33 b 34 d 35 c 36 d37 a 38 b 39 d 40 c
Physics 17
CHAPTER - 6OPTICAL INSTRUMENTS
Multiple Choice Questions1. Power of eye lens of an adult human being
is :a) 3D b) 4Dc) 5D d) 6D
2. Eye defect produced due to low convergingpower of eye lens :a) Hypermetropia b) Presbyopiac) Astigmatism d) Hyopia
3. Magnifying power of simple microscopewhen image is formed at infinity is given byM =
a)Df b) D
f
c) D × f d) 1
D f
4. Near point of the eye in case of normalhuman being isa) 25 cm b) 50 cmc) 100 cm d) infinity
5. Far point of the eye in case of normal humanbeing isa) 25 cm b) 50 cmc) 100 cm d) infinity
6. A person suffering from Myopia can not seea) near objects clearlyb) far off objects clearlyc) none of the objects clearlyd) none of these.
7. A person suffering from Hypermetropia cannot seea) near objects clearlyb) far off objects clearlyc) none of the objects clearlyd) none of these.
8. Cornea in the eye is a transparent sphericalstructure which ———— lighta) reflects b) refractsc) disperses d) scatters
9. The screen behind the eye lens is calleda) pupil b) irisc) retina d) ciliary muscle
10. The amount of light entering the eye iscontrolled bya) pupil b) irisc) retina d) cornea
11. The eye lens is aa) transparent double concave lensb) transparent double convex lensc) transparent convexo- concave lensd) transparent Plano concave lens
12. The eye lens contains a watery liquid calleda) vitreous humour b) aqueous humourc) water d) glycerin
13. Most of the refraction of light takes place ina) iris b) pupilc) cornea d) retina
14. The —————— muscles hold the eyelens in positiona) rod b) conesc) ciliary d) iris
15. The focal length of concave lens requiredto correct myopia isa) Less than the distance of far point from
eyeb) Equal to the distance of far point from
the eyec) equal to 25cmsd) equal to 125 cms
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16. In case of human eye, the image is formedata) cornea b) irisc) pupil d) retina
17. When the light is very brighta) iris contracts the pupilb) iris expands the pupilc) pupil expands the irisd) pupil contracts the iris
18 When the light is dima) iris contracts the pupilb) iris expands the pupilc) pupil expands the irisd) pupil contracts the iris
19. Magnifying power of an astronomicaltelescope for normal vision with usualnotation isa) –fo/fe b) –fo × fec) –fe × fo d) –fo + fe
20. The magnifying power of a compoundmicroscope in terms of magnification mo byobjective and me by the eyepiece is givenbya) mo/me b) mo × mec) mo + me d) mo – me
21. The magnifying power of a simplemicroscope can be increased if we use eyepiece ofa) higher focal lengthb) smaller focal lengthc) larger diameterd) smaller diameter
22 The focal length of a convex lens is 25cm.Its magnifying power will bea) 25 b) 52c) 2 d) 1.1
23. A person using a lens as a simple microscopesees an
a) inverted virtual imageb) inverted real magnified imagec) upright virtual imaged) upright real magnified image
24. The magnifying power of a simplemicroscope ‘‘m’’ is given by
a)UV b) 1 D
f
c) 1 fD
d) VU
25. The final image produced by a simplemicroscope isa) virtual and erectb) virtual and invertedc) real and erectd) real and inverted
26. Large aperture of telescope is used fora) greater magnificationb) greater resolutionc) to reduce lens aberrationd) ease of manufacturing
27. The image of a distant object as seenthrough an astronomical telescope isa) erect b) invertedc) horizontal d) none of these
28. The magnifying power of an astronomicaltelescope is 10. Then the ratio of the focallength of the objective to the focal length ofthe eyepiece isa) 1/10 b) 10c) 100 d) 1/100
29. A cylidrical lens is required to correcta) myopia b) presbyopiac) Hypermetropia d) Astigmatism
30 The astronomical telescope was invented bya) Galileo b) Keplerc) Newton d) Huygens
Physics 19
31. Color blindness is due toa) absence of cone cellsb) absence of rod cellsc) presence of rod cellsd) none of these
32. The rod cells correspond toa) the color of lightb) the source of lightc) the intensity of lightd) none of these
33. A compound microscope has magnifyingpower as 16. If magnifying power of eyepiece is 2, then find magnifying power ofobjectivea) 8 b) 10c) 6 d) 12
34. A person cannot see the objects beyond100cm. The power of a lens to correct thisvision will bea) +2D b) -1Dc) +5D d) 0.5D
35. Which is not a primary colour of light :a) Red b) Greenc) Yellow d) Blue
36. The focal lengths of objective and eyepieceof a compound microscope are fo and ferespectively. Thena) fo > feb) fo < fec) fo = fed) fo > or < fe
37. The focal length of a convex lens is 2.5cm.Its magnifying power will bea) 25 b) 52c) 11 d) 1.1
38. An astronomical telescope has a magnifyingpower 10. The focal length of eye piece is20 cm. The focal length of objective isa) 120 cm b) 200 cmc) 150 cm d) 180 cm
Answers1 b 2 a 3 a 4 a5 d 6 b 7 a 8 b9 c 10 a 11 b 12 a13 c 14 c 15 b 16 d17 a 18 b 19 a 20 b21 b 22 c 23 c 24 b25 a 26 b 27 b 28 b29 d 30 a 31 a 32 c33 a 34 b 35 c 36 b37 c 38 b
20 Physics
Multiple Choice Questions
1. What is unit of magnitude of magnetic field?a) Faraday b) Teslac) Newton d) Newton/m.
2. Which will be more magnetised after keepinginside solenoid ?a) Steel rod b) Iron nailsc) Iron core d) Copper rod.
3. In Fleming’s right hand rule, direction ofinduced current is given bya) thumb b) middle fingerb) first finger d) none of these
4. Magnetic field is produced by the flow ofcurrent in a straight conductor. Thisphenomenon was discovered bya) Faraday b) Maxwellc) Coulomb d) Oersted
5. Unit of magnetic induction B isa) NA–1m–1 b) NAm–1
c) Nm A–1 d) NA–1
6. An electric charge in uniform motionproducesa) an electric field onlyb) a magnetic field onlyc) both electric and magnetic fieldd) no such field at all
7. Magnetic induction is measured ina) webers b) Weber/mc) Weber/m2 d) Weber/m3
8. The force acting on a charge q moving witha velocity v in magnetic field of induction Bis given by
a) q v( ) B b)
q
v B
c) ( )vq
B d)
( )q
v
B
9. A charge q is moving with a velocity parallelto a magnetic field. Force on the charge dueto magnetic field is
a) qvB b)qvB
c) 0 d)Bvq
10. If the direction of the initial velocity of thecharged particle is perpendicular to themagnetic field, the orbit will bea) a straight line b) an ellipsec) a circle d) a helix
11. The direction of magnetic field produced bya linear current is given bya) right hand thumb ruleb) Fleming’s left hand rulec) Joule’s lawd) Ampere’s law
12. Two long parallel wires carrying currents inthe opposite directionsa) attract each otherb) repel each otherc) do not affect each otherd) get rotated to be to each other
13. If a current is passed through a spring thenthe spring willa) Expand b) Remain samec) compress d) none of these.
14. A motor convertsa) mechanical energy into electrical energyb) electrical energy into mechanical energyc) mechanical energy into sound energyd) electrical energy into sound energy
CHAPTER - 8MAGNETIC EFFECTS OF CURRENT
Physics 21
15. A dynamo convertsa) mechanical energy into electrical energyb) electrical energy into mechanical energyc) mechanical energy into sound energyd) electrical energy into sound energy
16. By increasing number of turns in a coil, thestrength of the magnetic fielda) increases b) decreasesc) first increases then decreasesd) remains unchanged
17. The phenomenon of electromagneticinduction was discovered bya) Maxwell b) Lenzc) Faraday d) Fleming
18. A current is passed through a straight wire.The magnetic field established around it hasits lines of forcesa) elliptical b) circularc) oval d) parabolic
19. A current is flowing north along a powerline. The direction of the magnetic fieldabove it, neglecting the earth’s field istowardsa) north b) eastc) south d) west
20. If a long hollow copper pipe carries a currentthe magnetic field produced will be:-a) inside the pipe onlyb) outside the pipe onlyc) neither inside nor outside the piped) both inside and outside the pipe
21. A magnetic fielda) always exerts a force on a charged
particleb) never exerts a force on a charged
particlec) exerts a force, if the charged particle is
moving across the magnetic field linesd) exerts a force, if the charged particle
is moving along the magnetic field lines
22. The net charge on a current carryingconductor isa) positive b) negativec) varying d) zero
23. When a charged particle enters in a uniformmagnetic field, its kinetic energya) remains constantb) increases c) decreasesd) becomes zero
24. The resistance of an ideal voltmeter isa) zero b) highc) infinite d) low
25. Magnetic lines of forcea) cannot intersect at allb) intersect at infinityc) intersect within the magnetd) intersect at the neutral point
26. Tesla is the unit of :-a) electric flux. b) magnetic flux.c) electric field. d) magnetic induction.
27. The most suitable metal for makingelectromagnets and transformer cores isa) steel b) ironc) copper d) aluminum
28. The most suitable metal for permanentmagnets isa) steel b) aluminumc) copper d) iron
29 Magnetic field intensity at the centre of acoil of 50 turns radius 0.5m and carrying acurrent of 2 A is:-a) 0.5 x 10-5 T b) 1.26 x 10-4 Tc) 3 x 10-5 T d) 4 x 10-5 T
30. Two parallel wires in free space are 10 cmapart and each carries a current of 10 A, inthe same direction. The force, one wireexerts on the other, per meter of length, isa) 2 × 10–4 N, attractive
22 Physics
b) 2 × 10–4 N, repulsivec) 2 × 10–7 N, attractived) 2 × 10–7 N, repulsive
31. The frequency of AC mains in India isa) 100 Hz b) 50 Hzc) 200 Hz d) 220 Hz
32. Electromagnets are used ina) telephones b) electric bellc) generators d) all of these
33. A compass needle placed just above a wirein which electrons are moving towards west,will pointa) west b) Northc) east d) south
34. 1 Tesla is equal toa) 106 Gauss b) 104 Gaussc) 103 Gauss d) 10-4 Gauss
35. A charge + q is moving in magnetic field Bwith velocity V. Then the force on it is:-
a) q V B( ) b) q V B( )
c) q B V( ) d) q B V( )
36. The relative permability of air isa) 1.5 b) 1c) 2 d) 1.8
37. The C.G.S unit of magnetic field B isa) Tesla b) Coulombc) Gauss d) Ampere
38. Galvanometer is used to detecta) Potential Differnceb) Electric Fieldc) Electric Currentd) Power
39. If number of turns, area and current througha coil are given n, A and I respectively thenits magnetic moment isa) nI/A b) IA/nc) nA/I d) nIA
40. The force on a current carrying conductorin a magnetic field is maximum when anglebetween current and magnetic field isa) 60° b) 90°c) 80° d) 120°
41. Magentic field out side the infinite solenoidisa) nI b) nIc) Infinite d) Zero
42. The best material for the core of atransformer isa) Hard Iron b) Soft Ironc) Copper Core d) Steel Rod
43. Magnetic field intensity at the centre of acoil of 50 turns radius 0.5m and carrying acurrent of 2 A is:-a) 0.5 x 10-5 Tb) 1.26 x 10-4 Tc) 3 x 10-5 Td) 4 x 10-5 T
Answers1 b 2 c 3 b 4 d5 a 6 c 7 c 8 a9 c 10 c 11 a 12 b13 b 14 b 15 a 16 a17 c 18 b 19 b 20 b21 c 22 d 23 d 24 c25 a 26 d 27 b 28 a29 b 30 a 31 b 32 d33 b 34 b 35 b 36 b37 c 38 c 39 d 40 b41 d 42 b 43 b
